/* Z轴层级范围从-10到10，不直接使用z-index设置z轴 */
.z-layer-negative-10 {
  z-index: -10;
}
.z-layer-negative-9 {
  z-index: -9;
}
.z-layer-negative-8 {
  z-index: -8;
}
.z-layer-negative-7 {
  z-index: -7;
}
.z-layer-negative-6 {
  z-index: -6;
}
.z-layer-negative-5 {
  z-index: -5;
}
.z-layer-negative-4 {
  z-index: -4;
}
.z-layer-negative-3 {
  z-index: -3;
}
.z-layer-negative-2 {
  z-index: -2;
}
.z-layer-negative-1 {
  z-index: -1;
}

.z-layer-1 {
  z-index: 1;
}
.z-layer-2 {
  z-index: 2;
}
.z-layer-3 {
  z-index: 3;
}
.z-layer-4 {
  z-index: 4;
}
.z-layer-5 {
  z-index: 5;
}
.z-layer-6 {
  z-index: 6;
}
.z-layer-7 {
  z-index: 7;
}
.z-layer-8 {
  z-index: 8;
}
.z-layer-9 {
  z-index: 9;
}
.z-layer-10 {
  z-index: 10;
}
